<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>下拉列表支持多选</title>
</head>
<body>
    <!-- 按住ctrl键多选 -->
    <!-- 下拉列表是select标签 设置multiple属性和size就能实现，mutiple支持多选，size显示条数 -->
    <select multiple="multiple">
        <option>河北省</option>
        <option>河南省</option>
        <option>山东省</option>
        <option>山西省</option>
        
    </select>
</body>
</html>